[Healeys] purpose of brass nuts

[Oudesluys]

Best to use the special copper covered self-locking nuts with flat steel 
washers. They often can also be had with a smaller than standard AF size 
to make fitting a bit easier when space is tight. Alternatively you can 
use tall brass nuts (for extra strength) arguably with split washers or 
cup washers. Specially with steel nuts with split or cup washers for 
apply copious amounts of copper-paste anti-seize compound on the 
threaded studs and in the nuts. It will not do any harm either with 
copper coated or brass nuts.
Because of the extreme heat and subsequent corrosion you will experience 
less problems when undoing copper coated/brass exhaust manifold nuts 
than with steel nuts.
Hairline cracks in manifolds often has to do with fitting the wrong 
gaskets in the past, thus deforming the manifold to much. Make sure that 
both surfaces are perfectly dead flat (milling machine) and fit the 
manifold preferably with a thin copper gasket or with a heat resistant 
sealant without gasket as often is done with the big Chrijsler V8's and 
their cast iron exhaust manifolds.
Kees Oudesluijs
NL


goldengt at cal.net schreef op 1-2-2014 17:28:
> Yesterday, I saw three hairline cracks in my intake manifold at the flanges. The last time I had the manifold off, I decided that the factory brass nuts were sort of tall and giving a little extra grief during header installation gyrations so I used plain steel nuts. Does someone know the purpose of the brass? Corrosion resistance is all I can think of.
> I am having the cracks welded.
> Thanks,
> Ken Freese
> 65 BJ9
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-- 
Kees Oudesluijs
Dorpsstraat 183
2995XG Heerjansdam
T: 078-677 1233
E: coudesluijs at chello.nl

Technische commissie Jensen Healey en GT
Het Jensen Genootschap Holland
www.jensenholland.nl